EP-4742517-A1 - MOTOR, CAMERA MODULE AND ELECTRONIC DEVICE

EP4742517A1EP 4742517 A1EP4742517 A1EP 4742517A1EP-4742517-A1

Abstract

Embodiments of this application relate to the motor field, and provide a motor, a camera module, and an electronic device. The motor include a lens carrier, a frame, a magnetic attraction mechanism, and two slide rail mechanisms. The two slide rail mechanisms are diagonally disposed between the frame and the lens carrier on a plane perpendicular to an optical axis direction of a lens and are configured to provide sliding support surfaces for movement of the lens carrier in the optical axis direction to reduce a friction force. A magnetic attraction force generated by the magnetic attraction mechanism is used to abut the lens carrier against the slide rail mechanisms. Because the two slide rail mechanisms are diagonally disposed, structural distribution is uniform, so that an overall force on the lens carrier becomes uniform. This facilitates structural stability, reduces a requirement of the motor on a magnetic attraction force, reduces a requirement for a driving force in autofocus, reduces power consumption and costs, facilitates a miniaturization design of the motor, and simplifies overall design difficulty.

Inventors

WANG, WEICHENG
YUAN, Shuai

Assignees

Honor Device Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240723

Claims (18)

A motor, comprising a housing, a lens carrier, a frame, a magnetic attraction mechanism and two slide rail mechanisms, wherein the lens carrier, the frame, the magnetic attraction mechanism and the two slide rail mechanisms accommodated in the housing, the lens carrier is configured to mount a lens; the two slide rail mechanisms are diagonally disposed between the frame and the lens carrier on a first plane and are configured to provide sliding support surfaces for movement of the lens carrier in a z direction, the first plane is perpendicular to the z direction, and the z direction is parallel to an optical axis direction of the lens; and one part of the magnetic attraction mechanism is disposed on the lens carrier, and the other part of the magnetic attraction mechanism is disposed on the frame, and a magnetic attraction force generated by the magnetic attraction mechanism is used to abut the lens carrier against the slide rail mechanisms.
The motor according to claim 1, wherein the slide rail mechanism comprises a guide post.
The motor according to claim 1 or 2, wherein two guide grooves are formed between the lens carrier and the frame, the two guide grooves correspond to the two slide rail mechanisms, one guide groove accommodates the corresponding slide rail mechanism, and the guide groove comprises a first opening slot disposed on the lens carrier and a second opening slot disposed on the frame.
The motor according to claim 3, wherein the magnetic attraction mechanism comprises two magnetic attraction assemblies, the two magnetic attraction assemblies are respectively located on two sides of the lens carrier or the frame, the two magnetic attraction assemblies are respectively adapted to the two guide grooves, and a direction of a magnetic attraction force generated by the magnetic attraction assembly is the same as an opening direction of the first opening slot of the adapted guide groove, wherein one magnetic attraction assembly comprises a first magnet and a first magnetically conductive sheet disposed corresponding to the first magnet, the other magnetic attraction assembly comprises a second magnet and a second magnetically conductive sheet disposed corresponding to the second magnet, one of the first magnet and the first magnetically conductive sheet is disposed on the lens carrier, the other one of the first magnet and the first magnetically conductive sheet is disposed on the frame, one of the second magnet and the second magnetically conductive sheet is disposed on the lens carrier, and the other one of the second magnet and the second magnetically conductive sheet is disposed on the frame.
The motor according to claim 4, wherein the two magnetic attraction assemblies are respectively located on two opposite sides of the lens carrier or the frame, at least one of the first magnet and the first magnetically conductive sheet is close to one of the slide rail mechanisms, and at least one of the second magnet and the second magnetically conductive sheet is close to the other slide rail mechanism.
The motor according to claim 4, wherein the two magnetic attraction assemblies are respectively located on two adjacent sides of the lens carrier or the frame.
The motor according to claim 6, wherein at least one of the first magnet and the first magnetically conductive sheet is close to one of the slide rail mechanisms, and at least one of the second magnet and the second magnetically conductive sheet is close to the other slide rail mechanism.
The motor according to claim 6 or 7, wherein the motor further comprises a first driving coil and a second driving coil, a driving force generated between the first driving coil and the first magnet enables the lens carrier to move in the z direction, and a driving force generated between the second driving coil and the second magnet enables the lens carrier to move in the z direction.
The motor according to claim 8, wherein both the first magnet and the second magnet are disposed on the lens carrier, and the first magnetically conductive sheet, the second magnetically conductive sheet, the first driving coil, and the second driving coil are all disposed on the frame.
The motor according to claim 8 or 9, wherein the motor further comprises a first driver chip and a second driver chip, the first driver chip is electrically connected to the first driving coil, and the second driver chip is electrically connected to the second driver chip.
The motor according to any one of claims 5 to 7, wherein the second magnet is disposed on the frame, and the second magnetically conductive sheet is disposed on the lens carrier; and the motor further comprises a third driving coil disposed on the frame, a driving force generated between the third driving coil and the second magnet enables the frame to drive the lens carrier to move in a first direction, and the first direction is perpendicular to the z direction.
The motor according to claim 3, wherein the two guide grooves comprise a first guide groove and a second guide groove, the two slide rail mechanisms comprise a first slide rail mechanism and a second slide rail mechanism, the first guide groove accommodates the first slide rail mechanism, and the second guide groove accommodates the second slide rail mechanism; the magnetic attraction mechanism is located on one side of the lens carrier, a direction of the magnetic attraction force generated by the magnetic attraction mechanism is the same as an opening direction of the first opening slot of the first guide groove, the magnetic attraction mechanism comprises a first magnet and a first magnetically conductive sheet, one of the first magnet and the first magnetically conductive sheet is disposed on the lens carrier, and the other one of the first magnet and the first magnetically conductive sheet is disposed on the frame; and a limiting structure is formed on the frame, the limiting structure and the magnetic attraction mechanism are respectively located on two opposite sides of the lens carrier, and the limiting structure is configured to restrict the lens carrier from shaking in a direction close to the magnetic attraction mechanism.
The motor according to claim 12, wherein the limiting structure is disposed adjacent to the second slide rail mechanism.
The motor according to claim 13, wherein a slot is formed at a position, of the lens carrier, adjacent to the second slide rail mechanism, the slot communicates with the first opening slot of the second guide groove, an extension direction of the slot is perpendicular to an opening direction of the first opening slot, the limiting structure is inserted into the slot, and the second opening slot of the second guide groove is formed on the limiting structure.
The motor according to any one of claims 4 to 7 and 11 to 14, wherein the first magnet is disposed on the lens carrier; and the motor further comprises a first driving coil disposed on the frame, the first driving coil is disposed on the frame, and a driving force generated between the first driving coil and the first magnet enables the lens carrier to move in the z direction.
The motor according to claim 15, wherein the motor further comprises a third magnetically conductive sheet disposed on the lens carrier to attract the first magnet to the lens carrier, and the third magnetically conductive sheet and the first magnetically conductive sheet are respectively located on two sides of the first magnet.
A camera module, comprising a lens and the motor according to any one of claims 1 to 16.
An electronic device, comprising the camera module according to claim 17.

Description

This application claims priority to Chinese Patent Application No. 202311332772.0, filed with the China National Intellectual Property Administration on October 13, 2023 and entitled "MOTOR, CAMERA MODULE, AND ELECTRONIC DEVICE", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the motor field, and more specifically, to a motor, a camera module, and an electronic device. BACKGROUND Motors are configured in current camera modules, and the motors generally have an autofocus function. For the autofocus function, a lens in a camera module is driven, by using a driving force provided by the motor, to move in an optical axis direction of the lens, to implement a focusing function. Currently, most motors are voice coil motors (voice coil motors, VCMs) implementing the autofocus function. The VCM motors are further classified into a ball-type motor and a spring-suspended motor. For the ball-type motor, a ball is disposed between a lens carrier of the motor and a frame sleeved on the lens carrier, to implement movement of the lens in the optical axis direction, so as to reduce resistance during movement. In addition, a magnetic attraction structure is further disposed on a same side on which the ball is disposed. A magnetic attraction force generated by the magnetic attraction structure enables the lens carrier to abut against the ball as much as possible, to maintain structural stability as much as possible and maximize utilization of contact between the ball and the lens carrier to reduce resistance. After the motor cooperates with the lens, a weight of a mover including the lens carrier and the lens is large. Because of the foregoing structure, a large magnetic attraction force is needed. In this case, the large magnetic attraction force causes an increase of a friction force during movement of the mover, and a driving force also increases with the friction force. Consequently, power consumption and costs increase. In addition, this does not facilitate a miniaturization design of the motor and increases overall design difficulty. SUMMARY Embodiments of this application provide a motor, a camera module, and an electronic device, to reduce a magnetic attraction force, so as to reduce design difficulty. According to a first aspect, a motor is provided and includes: a housing, a lens carrier accommodated in the housing, a frame, a magnetic attraction mechanism, and two slide rail mechanisms. The lens carrier is configured to mount a lens. The two slide rail mechanisms are diagonally disposed between the frame and the lens carrier on a first plane perpendicular to a z direction and are configured to provide sliding support surfaces for movement of the lens carrier in the z direction parallel to an optical axis direction. One part of the magnetic attraction mechanism is disposed on the lens carrier, and the other part of the magnetic attraction mechanism is disposed on the frame. A generated magnetic attraction force is used to abut the lens carrier against the slide rail mechanisms. In the foregoing embodiment, the motor includes two slide rail mechanisms that are disposed diagonally, so that the lens carrier interacts with the slide rail mechanisms at diagonal positions. In this way, an overall force on the lens carrier becomes uniform. This facilitates structural stability. Compared with a ball-type motor in the conventional technology in which a ball is disposed on one side, the motor with good stability in this application can avoid a phenomenon that the motor may undergo large-scale inversion in any state. Therefore, a needed magnetic attraction force is decreased, that is, the lens carrier may be in good contact with the slide rail mechanisms by using a small magnetic attraction force, so that the lens carrier well abuts against the slide rail mechanisms. This reduces a driving force needed in autofocus, reduces power consumption and costs, improves a focusing speed, facilitates a miniaturization design of the motor, and effectively simplifies overall design difficulty. Optionally, the slide rail mechanism includes a guide post. In the foregoing embodiment, because the guide post and the lens carrier are in surface contact with each other, a contact area between the guide post and the lens carrier is increased, so that a large extrusion force can be withstood. This prevents dents from being formed on the lens carrier, and facilitates movement of the lens carrier and the lens in the z direction, thereby improving the focusing speed. This is very applicable to a scenario involving a heavy lens. In addition, a columnar structure formed by extending the guide post in the z direction helps well guide movement of the lens carrier in the z direction. In this way, the lens carrier is not prone to tilting, thereby further improving structural stability. Optionally, two guide grooves are formed between the lens carrier and the frame. The two guide grooves correspond to